Testing device and method for coal rock mass grouting

Abstract

The invention discloses a testing device and method for coal rock mass grouting. The testing device comprises a steel high-pressure-bearing container, wherein a slurry inlet pipe is fixedly connected to one side of the outer wall of the steel high-pressure-bearing container in a penetrating mode, a slurry conveying pipeline is fixedly connected to one end of the slurry inlet pipe, a slurry feeding pipe is fixedly connected to one end of the slurry conveying pipeline, a high-pressure slurry injection machine is arranged at one end of the slurry feeding pipe, a feeding hopper is arranged at the top of the high-pressure slurry injection machine, a spacing mechanism is arranged in the inner cavity of the feeding hopper, a plurality of fixers are arranged in the inner cavity of the steel high-pressure-bearing container, and a first pressure gauge is arranged above the steel high-pressure-bearing container. By means of the arrangement of the steel high-pressure-bearing container, the high-pressure slurry injection machine and the fixers, the experimental device composed of the steel high-pressure-bearing container, the high-pressure slurry injection machine and the fixers is more reliable in structure, simpler and more convenient to arrange and lower in material cost.

Description

technical field [0001] The invention relates to the technical field of underground coal mining, in particular to a test device and a test method for grouting coal and rock mass. Background technique [0002] Coal resources have always been in a dominant position in my country's energy consumption structure, are the material basis for my country's national economic and social development, and are an important guarantee for my country's energy security. In recent years, with the continuous increase of mine mining depth and intensity, underground mining conditions have become increasingly complex. Especially under the action of "three highs and one disturbance" (i.e. high ground stress, high ground temperature, high karst water pressure and strong mining disturbance), the occurrence environment of deep coal and rock mass gradually deteriorates, resulting in the obvious development of secondary fractures in coal and rock mass. It has brought great difficulties to stope roof con...

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Problems solved by technology

Due to the strong concealment of grouting modification and reinforcement, complex on-site procedures, and high construction costs, the grout will flow, diffuse, and consolidate in the deep part of the coal and rock mass under the pressure drive, leading to in-situ experiments and evaluation of grouting improvement in coal mines Sexual reinforcement is more difficult

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